Lens-grinding machine.



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LENS GRINDING MACHINE.

APPL IGATION FILED SEPT.28,1906.

3 SHEETS-SHEET 1.

WITNESSES:

No. 842,676. PATENTED JAN. 29, 1907.

O. LAVALLEE. I LENS GRINDING MACHINE. API LIOATION FILED SEPT.28.1906.

S SHEETS-SHEET 2.

Mazda \X/ITPIEEEEEZ:

No. 842,676. I j PATENTBD JAN. 29, 1907. 0. LAVALLEB.

LENS GRINDING MACHINE.

APPLICATION FILED SEPT. 28.1906.

3 SHEETS-SHEET 3.

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T 3 "the claims.

UNI D STATES PATENT OLIVIER ,LAVALLEE, oF BosToN iinssnoiiuslirrs I LENS-GRINDING MACHINE.

Specification of Letters Patent.

Patented Jan. 29, 1907.

' Application filed s amberzaieoef Serial No. 336,581.

To all whom, it rmty concern.- Be it known that LQLIVIER LAVA LIin, a-citizen of the United States, residing in Boston,-in the oountyof Suffolk and-State of Massachusetts, have invented certain new and useful Improvements in Lens-Grinding Machines, of which the following is a specification.

, Thisinvention relates to] a machine for 1o, grinding the edges of 0 tical lenseswhereby the desired shape suc as round, ell ptical,

&c.is produced and particular size. 1 v u The general object-0f 'LhiSdIlVBIlblOIl or the lens ground to a I5 improvement is to produce a lens grindingmachine which will be less expensive than those now in common use; and other objects of the invention consist in providing in a relatively inexpensive machineimproved 2 mechanisms .for horizontally jreciprocating the lens across the edge of the grindstone 1nstead of reciprocating. the stone across the edge of the lens, for regulating the sizeof the lens in connectionwith themechanism for grinding s the -edge of the stone, for

in position t'o-be ground, and in Figs. 1 and 3 a portion of a grinding wheel is represented. Similar numerals of reference indicate cor- 4 res onding parts.

n a bed 4, adjustably plate 5 by means of 'suitablefbolts 6', are mounted standards 7 and 8, which are provided with bearings for a horizontal shaft 9.

1-5 This shaft'has ri idly secured to at t ne end a feed-screw 10, aving interlacingright and left threads engaged on the under side by a curvedpointer 11, which is integral with a: I vertical shank '12, extending throiigh the U- 5 shaped frai. 1e comprising the upper horizontal oition 13, the vertlcal portion 14, and the ower horizontalyoke-shaped portion 15,

secured to a base-- OF E-7.

which is secured at-1'6 to the bed 4. This pointer is adjustably held at the elevation required to hold it in engagement with the thread of the feedescr'ew bymeans of a set-,-

screw L7, which extends through the hub 18 of a pawl 19; This hub '18 surrounds the shank l2 and" rests on said portion 15, and

the outer end the pawl 19 is pressed by the free end of a'spring 20 whose opposite end is secured to the yoke-shaped portion 15, and thus the pawl and hub are prevented from c rotation on the shank 12, and the pointer 11' is held in line with the screw-thread.

Supported by the shaft 9 is a frame 21.

This frame is of bifurcated or yoke shape and comprises two arms-22 and 23..- The-lowerportion of the frame has integral with it ahorizontally b0red extension 24, which surrounds non-rigidly the shaft '9 and is'oscillated thereon. The arms 22 and 23 are prorespectively, with bearings for the shafts 26 and 27, the operation of which is described 'vided with bearings-for a horizontal shaft 25 and near their upper ends they are provided,

below. Rigid on the shaft 27 is agear-wheel 28, which is engaged by a gear-wheel 29, v

onthe shaft 25, and rigid on the shaft 26 isa gear-wheel 30, which is en aged by a gear-wheel31, which is rigid on t e opposite end of the shaft 25 from the gear-wheel 29.

These'four gear-wheels 28, 29, 30, and 31,

;are of-the'same diameter and have the same number of teeth. The gear wheel 29 is engaged by the-large gear wheel' 32, rigid on which extends'from the extended hu 36 of the shaft 9, and this. gear-wheel 32 is pro? vided with an extended hub 33, which is horizontally bored at'34 to receive a in 35,

c the grooved pulley 3 8,which is normally idle on the shaft 9;' The extended hub 36 is pro-' vided'with' an annular groove 37, which is engage'd, by the yoke 39," extendingifrom and a integral with the slide 40, which is adapted to move horizontally in the slideway or-groove 4-1, formed in the rear or'inner-surface ofthe vertical plate 42, which is bolted at-43 to the bed 4. Thus the two parts 33 and 36 constitute the two members of a'olutch which by means of the yoke 39 are moved into engagement, whereby when motion is imparted to.

the drivin -wheel'38 it is transmitted to the gear-whee 32and thence to the shaft 9, gearof the gear-wheel 32.

wheels 28, 29, 30, and 31 and shafts 25, 26, and 27. The slide isprovided at the end opposite from the yoke 39 with an inwardlyprbjecting arm 44, providedwith a bored extension 45, supporting a pin 46, provided with the head 47, which bears against the face A spring 48 surrounds the pin 46between the head 47 and the arm 44 and holds said arm normally with its ex tension against a nut 49 on they opposite end of the pin 46. -Tl1us the slide 40 and yoke 39 are held normally toward the right and. the pin 35 is held normally the "recess 3.4,. thus keeping the two members of the clutch in engagement.

2:1, and the arm 44 is provided with an extension 52, which is held against the cam bylthe spring 48. .When the frame is in working position-that is, swun g rearward and in the position indicated in the drawings-the spring holds the extension 52 against the lower portion; of the edge of the cam and holds the members-of the clutch in en agement. When the frame isswung forward out of its w0rl ing position, the cam moves the extension 52, and consequently the entire slide 40 39 44, .to-

ward the left against the power of the spring 48 and by means of the yoke portion 39 moves the clutch member 36 out of engage ment with the member 33, thus causing thepulley 38 to run idly.

The shaft 27, which is directly driven by the gear 28, is provided on its inner ends with horizontal pins'53' for supporting or holding: the pattern 54, and: the shaft 26,

which is directly driven .by the gear wheel 30,.is provided on its-inner end. with a disk or .head 26*, and the-lens 5 tobe'ground is held between two friction-c shions 56 by means of. a spiral spring 57, which surrounds the shaft 26 within the tubular portion ,58, said spring lying between the sleeve 59- andthe ring 60. The outer end of the tubular. portion 58 is beveled off, whereby it is in engagement witu a cam 61, which surrounds the shaft between the beveled end of'the portion 58 and the gear 30. The cam 61 is provided with a suitable lever or handle 62, whereby it can be rotated and the shaft thereby withdrawn into the portion 58. for applying and. removing the lens 55 and the pattern 54'. This metdiod of holding the lens and pattern as the former is ground and for withdrawing the same is not broadly newi-n this invention.

63 represents the grindstone, which is not adapted to reciprocate horizontally, but 170- tates on a singleplane.

] 64 represents a rearwardly-inclined frame which is adapted to swing-on a shaft 65', supported bysuitable cars 66, which are mounted on the bed 4 behind the swinging frame 21. This frame 64 is. provided with up wardly-exten'ding arms 67, which support a I A cam 50 is secured at 51 to the portion 24 of the swinging frame horizontal guiderod 68, and above. theguiderod a shaft 69, which is adapted to be recip rocated horizontally in thearm 67. Mounted on the shaft 69 is a pattern-holder 70, which extends upward and isadapted to be moved horizontally by means of said. shaft until a vertical groove 71 in its front surface receives the edge of the pattern, as indicated in the drawings. This grooved holder is prevented from swinging toward or from the frame 21 by means of a wire or foot 7 2,which extends in front of the rod 68, while the lower end of the main portion extends behind the rod.

A spring 73 connects the frame 21 with the stationary shaft 01' rod 65, whereby said frame is held normally rearward, the pattern 54 extending "into the groove 71 in the pattern-holder 70. v i

The under side of the portion 24 of the frame 21 has screwed to it a plate 74, whose forward end is provided with a downwardextending lip 75. A latch 76' swings at its rear end from the shaft or rod 65 and is prov vided on itsupper surface with a notch 77.

The forward endof the latch is extended into a handle or thumb-piece 78. This latch is held normally in the raised position illustrated against the lip 75 by a spring 79,.

which extends up from the bed 4'against the under side of the latch, Swinging the frame 21 forward not only causes the cam 50 to open the clutch and stop the machine, but

brings the notch 77 in the latch in'engagementiwith the lip 75 and locks the frame in its forward position.

80 represents a disk or dial suitably inscribed, preferably with figures indicating millimeters, said dial being rigidly mounted. on the-upper side of the front end of the arm or lever 81, whose rear end is bolted at 82 tothe lower portion of the pattern-holder 70:

A screw 83 is provided with a plain upper end which extends through corresponding openwitha'head84, having a thumb-piece 85.

end of the screw turns in. the suitablythreaded opening 87 in the bed 4. By rotating this'screw by means of the handle85 the upper end of the pattern-holder is swung forward or rearward, as desired.

j the latch 7 6. The proper pattern 54 is then applied by means of the pins 53, as shown, and the lens applied in position by swinging up the handle or'lever 62,.thus withdrawing the shaft 26, whereby the'lens 55 may be placed between, cushions 56, and the cushions and lens inserted between thedisk orhead ings in the arm 81 anddial 80 and isprovided A pointer 86 extends from this head 84 radially over the surface of'the dial, and the threaded 26 'on the inner end of the shaft 26 and the pattern 54 and held in such position by reing the amount in thickness from the edge of leasing thelever 62. The pointer 86 is then moved by-rotating the handle 85 until it points to the number of millimeters indicatthe. lens desired to be moved. This operation having, by 'means of a screw 83,.swung -the pattern-holder 70 into the desired position, the swinging frame 21 23 is released by -pressing-down the latch 76, andthe spring 73 forces said frame back until the patternr54 enters the groove 71 in the pattern-holder,

and the edge of the lens 55 comes in contact with the grindstone 63 and is held in such contact by the power of the spring 73., At

the same time the cam 50 releases the open clutch-mechanismand the spring 48close's it, so that its members 36 and 33 are-in.engagement, and the lens isrotated with its edge against the 'grindstone until .a sufficient amount of the edge is ground 03 to enable the pattern to reach the bottom of the groove 71, as indicated in Fig. '3. grinding process the frame 21 23, with its gear-wheels 28 29 3O 31, the gear-wheel 32,

horizontal reciprocation of the shaft 9,

the driving-wheel 38, and the clutch mechanism are reciprocated horizontally with the produced by the interlacing right and left thread feed-screw, so that the lens traverses the width of the edge of the grindstone, such width being substantially equal to the length of said-screw. At the same time the patternholder and pattern reciprocate horizontally with the reciprocation of the frame, such re- Ncipro'cation being made possible by the pat:

tern-holder being: made rigid on the guiderod 69, which slips in the frame 64. The f communication of the horizontal reciproeating movement of the shaft 9 to the frame.21

and 23 and its connections and the drivingwheel 38 ismadepossible and produced by the slide 40, which engages, bymeans of the yoke 39, the clutch member 36, and-a collar 88, which-.isrigid on the shaft 9, whereby the portion 24 of the swinging frame and thegear-wheel 32 are heldon the shaft between said collar and oke.

Having thus what I claim, and desire to secure by'Letters Patent, is

' 1. In a machine of the character described,

a driving-shaft, means for longitudinally reciprocating said shaft, a swinging frame on" said shaft adapted to be reciprocated longi-. -tudinally thereby said frame being provided with means for holding the shafts whichro tate the, lens and the pattern, a patternholder located intermediate of the edge of the pattern and the grindstone and adapted to be reciprocated with the pattern assaid lens traverses the edge of the grindstone, means for holding the swinging frame with the edge During this lly described my invention means for holding'the swinging frame forfor transmitting motion'from the drivingshaft to the. shafts forrotating the lens and pattern, clutch mechanism intermediate; of said transmitting mechanism and the drivingshaft,'and mechanism for closingor brin ing into engagement the clutch mechanism w en the swinging frame islnoved toward the grindstone and for opening or disengaging said clutch mechanismwhen the swinging stone;

2. In a screw having interlacing right and left threads rigid on said shaft whereby longitua swinging frame. on. said shaft and adapted shafts mounted in said frame for rotating the lens and pattern, mechanism intermediate of pattern, a driving-wheel loose on the drivingshaft, clutch members rigid respectively with ing-gear of the mechanism intermediate of the drivin shaft and the lens and patternshafts, a side supported 'by the bedof the machine and provided with an arm which engages the clutch member which is rigid and a cam on the swinging frame and in engagementwithsaid second arm whereby as ,the swinging frame is swung forward the clutch is opened and the machine allowed to stop. j 3. In a machine of the character described, a swinging frame, shafts mounted in said frame for rotating the lens and the pattern, mechanism for longitudinally reciprocatin said frame whereby the lens is reciprocate cated between the swinging frame and the ported by said frame and extending up there from between the pattern and the grindstone and adapted to receive in its groove the edge of the pattern, and means whereby the frame is moved forward away from thegrind-' a machme of the character described,

said driving-wheel and with the main drivgrooved pattern-holder is allowed to be refrom between the pattern and the grindstone I of the lens bearing against the griiidstone, a

ward away from thegrindstone, mechanism dinal reciprocation is imparted to the shaft, I

to'be reciprocated longitudinally thereby, 8 5

the-driving-shaft and the lens and pattern-. shafts for imparting rotation to the lens and with the drivin -wheel, a second arm extending from the sli e toward the swinging frame, U

acro'ssthe edge of the grindstone, a frame 10- IIC grindstone, a grooved pattern-holder sup- 1&

ing from the pattern-holder frame and adap bnd to engage with the lip when the swinging frame-1s swung forward .and hold 1t lnsuch Forward position,

.In pestin'lony whereof I have signed my arm to this specification in the presence of *0 subscribing Witnesses. Y u

V ()LlVlER -LAVALLEE'. \Vitnesses ARTHUR CARROLL, A. K. HOOD. 

